P_CANSEE(9) | FreeBSD Kernel Developer's Manual | P_CANSEE(9) |
NAME
p_cansee — determine visibility of a processSYNOPSIS
#include < sys/param.h>#include < sys/proc.h>
int
p_cansee( struct thread *td, struct proc *p);
DESCRIPTION
This function can be used to determine if a given process p is visible to the thread td, where the notion of “visibility” may be read as “awareness of existence”.The function is implemented using cr_cansee(9), and the dependencies on sysctl(8) variables documented in the cr_cansee(9) manual page apply.
RETURN VALUES
The p_cansee() function returns0
if the process denoted by
p is visible by thread
td, or a non-zero error return value otherwise.
ERRORS
- [ ESRCH]
- Process p is not visible to thread td as determined by cr_cansee(9).
- [ ESRCH]
- Thread td has been jailed and process p does not belong to the same jail as td.
- [ ESRCH]
- The MAC subsystem denied visibility.
November 19, 2006 | FreeBSD |